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The direction is marked as In, meaning this is a value we re going to pass in to our query or stored procedure Within our parameter, we have a TypeDescriptor element A TypeDescriptor is a way of defining the parameter s data type For input parameters, they re generally only a single level deep, but we ll soon see that, for Out parameters, type descriptors can be multilevel and get quite complex Back to looking at our particular type descriptor, we can see here we have a TypeName, which casts the values as a particular NET framework type If the parameter you re passing in is being used against a column that s also marked as an Identifier, you must mark it as such by adding the IdentifierName in the type descriptor.

Pioneers: Unwiring BellSouth Telecommunications "May the Field Force Be With You"

setValue() method with the default value or by calling the form object s setDefaults()

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This isn t necessarily used in the finder method, but we ll see why it s important in a SpecificFinder method shortly If this parameter is something for which a user can dynamically supply a value, this will be achieved by matching the parameter with a filter descriptor We do this by adding an AssociatedFilter attribute to the parameter s type descriptor with the value matching a filter descriptor Within our TypeDescriptor element for our input parameter, we have some DefaultValues elements Our SQL statement could contain one, two, or three parameters, for example, username, age, city The user may want to filter only by username, so to allow the statement to be executed with just this one userentered filter default values are described that can be substituted in if they re not supplied by the user You ll see our DefaultValue element has a MethodInstance attribute.

Fifteen thousand field service technicians are part of BellSouth Telecommunications, the support organization for wireline phone network operations in nine states in the southeastern United States Now, thanks to a massive wireless data implementation, the field force is able to access up-to-the minute customer service and network status information, speeding transaction times and saving on average 45 minutes per day per technician The solution uses Cingular Interactive s Mobitex network, Broadbeam s wireless messaging server, ExpressQ, Itronix XC6250 ruggedized laptops (see Figure 32), and a custom-built field service dispatch application created by BellSouth using services from Andersen Consulting (now Accenture) It has taken seven full years to evolve the success it enjoys today being a pioneer has its rewards In 1994, BellSouth was beginning to look at a mobile computing platform for service technicians because the company s field workers were having difficulty finding dial tone to link with dispatch centers and parts and inventory We were probably at a better vantage point than other service companies because at least we had the familiarity with where a phone was in a particular subdivision or industrial park," noted Gary Dennis, general manager of BellSouth Telecommunications network operations solutions group But the technicians often had to use customers phones to obtain trouble tickets and service orders, so we looked at three options at the time, and the most logical starting point was, Why don t we use a cellular network to transmit circuit-switched data That was a blind alley" At first, Dennis and his staff Figure 32 BellSouth Field Technician Connects tested a cellular solution with 20 techUsing Wireless to Expedite Trouble Ticket Resolution

Method instances are defined at the end of a method, which we ll cover shortly For now just remember that your DefaultValue element will need a MethodInstance element Our DefaultValue also has to have a type, such as SystemInt32 Again, this is a NET type, the same as the TypeName of our main Parameter element Input parameters won t be directly mapped to filter descriptors for SpecificFinder methods This is because the parameter that s used to return a unique row by the SpecificFinder is only really ever used internally by the BDC, and not in the user interface In fact, it only really makes sense to create filter descriptors for the Finder method So that covers input parameters Pretty simple, huh Now we come to output parameters quite a scary beast!.

Figure 3-11

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